Probably Handoff and cross-device application state syncing.
Isn't this Private Relay masking your IP? https://support.apple.com/en-us/102602
The article calls out Safari but my understanding is it applies to email also.
One Apple Mail feature nobody here has commented on was called Piano Mover internally. I don’t know the public marketing name. It lets attachments over 10MB in emails be replaced with iCloud hosted file references.
I assume for the same reason the OS pings Cupertino when you run a binary - surveillance, masquerading as protection.
Why’s this post below an older less popular one? https://i.ibb.co/jnpcFJz/IMG-0549.jpg
Jeff Johnson is an Apple privacy information hero and deserves every penny for his apps like StopTheMadness https://underpassapp.com/StopTheMadness
Everyone wearing their tinfoil hat while using Gmail and drive for everything
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Fun activity: install glasswire on windows for a day or 2, set it to prompt you before any connection is allowed, and watch as about 500 different windows components attempt connections with Microsoft as a result of any and every action. And how many onedrive exes randomly fire off throughout the day despite having never once used it. And how onedrive changes its version number every day when it realizes it can’t connect.